/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.apache.flink.sql.parser.hive.ddl;

import org.apache.flink.sql.parser.ddl.SqlAlterTable;
import org.apache.flink.sql.parser.hive.impl.ParseException;

import org.apache.calcite.sql.SqlIdentifier;
import org.apache.calcite.sql.SqlNode;
import org.apache.calcite.sql.SqlNodeList;
import org.apache.calcite.sql.SqlWriter;
import org.apache.calcite.sql.parser.SqlParserPos;
import org.apache.calcite.util.ImmutableNullableList;

import javax.annotation.Nonnull;

import java.util.List;

/**
 * ALTER TABLE DDL to change the specifications of a Hive partition.
 */
public class SqlAlterHivePartitionRename extends SqlAlterTable {

	private final SqlNodeList newPartSpec;

	public SqlAlterHivePartitionRename(SqlParserPos pos, SqlIdentifier tableName,
			SqlNodeList partSpec, SqlNodeList newPartSpec) throws ParseException {
		super(pos, tableName, partSpec);
		if (partSpec == null || newPartSpec == null) {
			throw new ParseException("Both old and new partition spec have to be specified");
		}
		HiveDDLUtils.unescapePartitionSpec(partSpec);
		HiveDDLUtils.unescapePartitionSpec(newPartSpec);
		this.newPartSpec = newPartSpec;
	}

	@Nonnull
	@Override
	public List<SqlNode> getOperandList() {
		return ImmutableNullableList.of(tableIdentifier, getPartitionSpec(), newPartSpec);
	}

	@Override
	public void unparse(SqlWriter writer, int leftPrec, int rightPrec) {
		super.unparse(writer, leftPrec, rightPrec);
		writer.newlineAndIndent();
		writer.keyword("RENAME TO");
		writer.newlineAndIndent();
		writer.keyword("PARTITION");
		newPartSpec.unparse(writer, getOperator().getLeftPrec(), getOperator().getRightPrec());
	}

	public SqlNodeList getNewPartSpec() {
		return newPartSpec;
	}
}
